In this Feb. 7, 2018, photo, two scientists test space suits and a geo-radar for use in a future Mars mission in the Dhofar desert of southern Oman. The desolate desert in southern Oman resembles Mars so much that more than 200 scientists from 25 nations organized by the Austrian Space Forum are using it for the next four weeks to field-test technology for a manned mission to Mars. (AP Photo/Sam McNeil)
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